Baxi combi boiler error code 133

My Baxi combi boiler which is only three and a half years old has developed an intermittent fault which strangely happens almost every evening and shows an error code of E133. The Baxi engineer said it was due to a faulty meter regulator and undersized gas supply pipe to the boiler. They called Northern Gas Networks who came out, checked the meter pressure and regulator but found no problem with either. They got a much higher reading than the Baxi engineer. I am now without any heat or hot water and am awaiting another visit from a different Baxi engineer tomorrow for a second opinion. Has anyone else had this issue? I can,t understand why the pipe work would be an issue when we have had no issues since the boiler was installed in 2019.

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  • ThisIsWeird
    ThisIsWeird Posts: 4,458
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    I know nothing about that code, other than what Google tells me. And that suggests it's either a gas supply failure, or an ignition fault (well done Baxi - you've covered all bases with that one).
    Yes, a faulty gas regulator can produce that result, but NGN guy reckons all is fine there. An undersized gas supply pipe could also cause this, but really only if it was undersized from the beginning, and yours has seemingly been fine for over 3 years. It's possible - tho' not likely - that a borderline gas pipe size might help highlight a slight drop in the meter gas delivery.
    This ain't rocket science. Your new Baxi GS should be able to do a good double-check, and even calc whether your existing gas pipe is adequate in the first place - that's a judgement/calculation/decision every GS has to make with every combi. Not R-S.
    Hopefully this new guy can arrive at a decisive answer. And then you claim back any payment made to any incompetent fellow :smile:
  • FreeBear
    FreeBear Posts: 14,255
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    ThisIsWeird said: This ain't rocket science. Your new Baxi GS should be able to do a good double-check, and even calc whether your existing gas pipe is adequate in the first place - that's a judgement/calculation/decision every GS has to make with every combi.
    The calculations for length of pipe and allowances for elbows/bends are freely available online. Easy enough to work out if X metres of pipe with Z elbows will cause excessive pressure drop when the boiler calls for maximum gas. Checking the figures for some engineers doesn't appear to be so easy....
    According to the calculations I did for my boiler, I need 28mm pipe for at least 6m, followed by 22mm before going in to 15mm for the last ~500mm. Engineer has used 22mm up until the last ~500mm and has declared the pressure drop to be within guidelines. However, he never ran the boiler at full power, and I can not be confident in his measurements. Will have a Viessmann trained engineer to do the first service, and rip in to the company that did the install if (when) any issues come to light.

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  • copenhagen1
    copenhagen1 Posts: 5
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    So a second engineer called out today and replaced a part on the boiler. He said there was no problem with the gas pressure. He had the boiler working perfectly and it continued to do so until this evening when once again it stopped working with the error E133 displayed. Got it working by turning the water and radiator temperature to maximum and pressing the rest button. I will be calling Baxi in the morning to arrange another engineer visit. Maybe it will be 3rd time lucky. Has anyone else had this problem?
  • jefaz07
    jefaz07 Posts: 530
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    edited 12 January at 9:01PM
    Seen it many times. Could be ignition probes, gas valve needing fully reset or changed, faulty expansion vessel leaking into the spade connectors, spark gen, ionisation probe, can even be to do with the condensate. 
    You’d have to see it to check unfortunately. 
  • copenhagen1
    copenhagen1 Posts: 5
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    Well it was third time lucky. The Baxi engineer replaced the probe and all working fine now. 
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